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Amelogenins in human developing and mature dental pulp.
1Department of Orofacial Sciences, University of California at San Francisco, Box #0422, San Francisco, CA 94143-0422, USA.
Journal of Dental Research
|August 26, 2006
Summary
Amelogenins, key enamel proteins, are expressed by human odontoblasts during tooth development. Low-molecular-weight amelogenins promote pulp and papilla cell proliferation, influencing dentin-pulp complex development.
Area of Science:
- Biochemistry
- Developmental Biology
- Oral Biology
Background:
- Amelogenins are heterogeneous proteins crucial for developing tooth enamel.
- They have been previously reported in odontoblasts, the cells forming dentin.
Purpose of the Study:
- To investigate the expression and function of amelogenins within the human dentin-pulp complex.
- To determine the role of amelogenins in pulp and papilla cell behavior.
Main Methods:
- Immunohistochemistry and in situ hybridization were used to detect amelogenin protein and mRNA in developing human teeth.
- Recombinant amelogenins were applied to pulp and papilla cells to assess proliferation (BrdU assay) and differentiation (alkaline phosphatase expression).
Main Results:
- Amelogenin protein was identified in the forming dentin matrix.
- Amelogenin mRNA was localized in dentin, likely within odontoblast processes.
- Recombinant human amelogenin rH72 (LRAP+ exon 4) enhanced papilla cell proliferation.
- Recombinant amelogenins rH72 and rH58 (LRAP) stimulated pulp cell proliferation, while rH174 had no effect.
Conclusions:
- Human odontoblasts actively synthesize and secrete amelogenin protein during tooth development.
- Specific low-molecular-weight amelogenins can stimulate the proliferation of cells within the dentin-pulp complex.
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